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The following guidelines may be used to accomplish these objectives: 



a. Remove all high risks, diseased and dead trees (including 

 pulpable material), 



b. Leave dominant or co-dominant trees, capable of release, with 

 at least 40% crown, 



c. Leave trees should be spaced as near equidistant as possible, 



d. Logging should be done in a manner least damaging to the 

 residual stand. 



2. Clearcutting 



This harvesting system involves the removal of all utilizable material 

 from within the cutting boundaries and provides for proper slash disposal 

 and site preparation to encourage regeneration of the area with desirable 

 species. The understory is usually removed in order to provide a seedbed 

 and reduce competition. 



The size and shape of clearcut areas must be flexible enough to: 

 consider the economy of the logging; the ease and quality of slash disposal; 

 permit scarification of the area to prepare a seedbed; to have an adequate 

 seed source; with due consideration for visual impacts on the landscape. 



Specifications for clearcut blocks: 



a. Size 



1) Shade Tolerant Species (Douglas-Fir, Englemann spruce, 

 grand fir, sub-alpine fir) 



Clearcut units should be narrow, less than 200 feet, to 

 reduce the chances of insolation loss. The units should be 

 orientated to afford the least exposure time to direct sun- 

 light. 



2) Shade Intolerant Species (lodgepole pine, western larch, 

 ponderosa pine) 



Clearcut units should be over 200 feet wide and greater 

 than 1/2 acre in size. The maximum size should not exceed 

 40 acres if the unit is essentially square. No point in the 

 unit should be more than 10 chains (660 feet) from the nearest 

 seed source. 



b. Boundaries 



Logging roads and ridges make desirable boundaries for 

 fire control. When a ridge is used, the cutting boundary 

 should be placed slightly over the crest as slash fires are 

 very difficult to stop right on top of a ridge. Whenever a 

 ridge cannot be a boundary, boundaries should be blended to 

 the physiographic features. 



